Manufacture of bricks, shaped stones, or blocks, tubes, tiles, and the like.



UNITED STATES PATENT OFFICE.

HEINRICH DRESLER, OF CREUZTHAL, GERMANY.

mancrac'rmm or BRICKS, SHAPED scenes, es BLocKs, Teens, TILES, ms LIKE.

Specification of Letters Patent.

Patented Nov. a, 19cc.

Application filed September 23, 1908. Serial No. 464,353.

To all whom it may concern:

Be it known that I, I-lnmiuon DRESLER, director of the Ciiln Miisenerlicrgwcrks ()cticn Vorein, of Crcuzthal, \Vestphalia, Germany, a subjectof the German Emperor, and resident of Creuzthal, Westphalia, Germany,have invented a new and useful Improved Manufacture of Bricks, ShapedStones, or Blocks, Tubes, Tiles, and the Like, of which the following isa specification.

blag stones, or blocks hardened by means of carbonic acid, have beenhitherto manufactured from either water-granulated slag or ground slagsolidified in the open air.

his invention relates to the manufacture of bricks, stones, pipes, tilesand the like from slag with the action of carbonic acid, or gasescontaining carbonic acid, on the molded or shaped articles, with orwithout addition of lime, the novelty of this process being that themanufacture of the moldings is effected not, as hitherto, from a. singleslag material, but from a mixture of slags prepared in ditl'ercntmanners. Thus, for instance, slag granulated by means of water, is mixedwith slag solidified in the 0 ion air and reduced or grounded or m aecomposed state. By slag solidified in the open air is meant slag whichis cooled in the air from the hot liquid state and solidified. Inpractice it is also called block or piece sla n the followingdescription the aforementioned mixture is moistened with water in themanner usual in the case of slag blocks or moldings, and compressed intomolds or forms which are then exposed to the action of carbonic acidunder pressure. This process has the advantage over similar well knownprocesses that the wei ht of the blocks etc. can be considerably reneed, without afi'ectin the required strength of the same. The blocks orproducts obtained are of beautiful appearance as the slag grains and theslag powder appear to have melted or blended therein into one mass. Forincreasing the strength, it may be advisable in certain cases to add asmall percentage of lime. The experiments of the applicants have shownhowever that a mixture of 50% of slag powder or meal and 50% of slagsand, even without addition of lime, gives a product which can resist apressure of over 4500 pounds )er square centimeter. This strength is socient for all purposes, and the reduction of weight referred to enablesthe blocks etc. to be shipped to greater distances than would bew-orunnically possible with stones made of slag solidified in the air,alone. As moreover the grinding of slag is more expensive than mixingand as with the same output of blocks the grinding is re duced by theprocess according to this invention, the cost of manufacture accordingto this process is considerably reduced, which means an importanttechnical advantage.

The blocks prepared by the new process are porous, which, withoutaffecting their strength, has the advantage that the mortar adheres wellto their surface. Moldings which are made only from air-solidified slag,easily crack during compression, and on the removal of the press dieadhere to the die, so that a great deal of waste is caused. If, however,a mixture of slag is used, according to this invention, the compressionof the moldings takes place easily and without. any waste. The hardeningin vessels by carbonic acid requires by this invention much less time,and, owing to the greater porosity, the acid penetrates deeper into thearticles. The greater porosity of the blocks obtained by the processaccording to this invention, has the further advantage that the blocksdry more quickly, and thus buildings are rendered more healthy.

The process is preferably carried out in such manner that the two kindsof slag are mixed together, and the moldings are prepared from the saidmixture without the use of any binding material. They are introducedthen into an air tight closed tank, into which carbonic acid isadmitted, and are thus caused to harden. In order to increase the actionof the carbonic acid to a still greater extent, the tank in which thehardening takes place, is first entirely or partly pumped free from airafter the introduction of the moldings, and before the admission of thecarbonic acid. Gases containing carbonic acid could however be alsopassed through the vessel which is then closed, a partial vacuum beingautomatically pro duced by the absorption of the carbonic acid.

( laims.

1. The process of manufacturing bricks and similar articles, whichconsists in mixing Water granulated slag with ground $111 that has beensolidified in the open air, mo ding the mixture, and subjecting themolded prodnot to the action of carbonic acid gas under pressure for thepurpose of acting on any 2 eospea water, molded together insubstantially equal parts and hardened by carbonic acid gas,substantially as described.

In testimony, that I claim the foregoing as my invention, I have signedmy name in resence of two witnesses, this 9th day of s eptember 1908.

HEINRICH DRESLER.

free lime that may be present, substantially as described.

2. A composition of matter forming bricks and similar articles,consisting of a mixture of slag solidified in the open air andpulverized, and of sin granulated in Water, molded together and iardenedunder pressure of carbonic acid gas, substantially as described.

A composition of matter forming bricks and similar articles, consistingof a Witnesses: mixture of slag solidified in the open air l LOUISVANDORN, and pulverized and of slag granulated in H. STELZER.

